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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-24 09:25:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-24 09:25:39 -0700
commit4def1963608ed2b61aca5b52fdedb4ca2798820c (patch)
tree83b36e8ff3c5eabe0d235f863adcf54f838f838a /arch
parent5e8704ac1cfa9fceef94fcc457e18613b1589b34 (diff)
parent82c9a927bc5df6e06b72d206d24a9d10cced4eb5 (diff)
download96b-common-4def1963608ed2b61aca5b52fdedb4ca2798820c.tar.gz
Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull namespace fixes from Eric Biederman: "This is a set of four fairly obvious bug fixes: - a switch from d_find_alias to d_find_any_alias because the xattr code perversely takes a dentry - two mutex vs copy_to_user fixes from Jann Horn - a fix to use a sanitized size not the size userspace passed in from Christian Brauner" * 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: getxattr: use correct xattr length sys: don't hold uts_sem while accessing userspace memory userns: move user access out of the mutex cap_inode_getsecurity: use d_find_any_alias() instead of d_find_alias()
Diffstat (limited to 'arch')
-rw-r--r--arch/alpha/kernel/osf_sys.c51
-rw-r--r--arch/sparc/kernel/sys_sparc_32.c22
-rw-r--r--arch/sparc/kernel/sys_sparc_64.c20
3 files changed, 49 insertions, 44 deletions
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index c210a25dd6da..cff52d8ffdb1 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -530,24 +530,19 @@ SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
SYSCALL_DEFINE1(osf_utsname, char __user *, name)
{
int error;
+ char tmp[5 * 32];
down_read(&uts_sem);
- error = -EFAULT;
- if (copy_to_user(name + 0, utsname()->sysname, 32))
- goto out;
- if (copy_to_user(name + 32, utsname()->nodename, 32))
- goto out;
- if (copy_to_user(name + 64, utsname()->release, 32))
- goto out;
- if (copy_to_user(name + 96, utsname()->version, 32))
- goto out;
- if (copy_to_user(name + 128, utsname()->machine, 32))
- goto out;
+ memcpy(tmp + 0 * 32, utsname()->sysname, 32);
+ memcpy(tmp + 1 * 32, utsname()->nodename, 32);
+ memcpy(tmp + 2 * 32, utsname()->release, 32);
+ memcpy(tmp + 3 * 32, utsname()->version, 32);
+ memcpy(tmp + 4 * 32, utsname()->machine, 32);
+ up_read(&uts_sem);
- error = 0;
- out:
- up_read(&uts_sem);
- return error;
+ if (copy_to_user(name, tmp, sizeof(tmp)))
+ return -EFAULT;
+ return 0;
}
SYSCALL_DEFINE0(getpagesize)
@@ -567,18 +562,21 @@ SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
{
int len, err = 0;
char *kname;
+ char tmp[32];
- if (namelen > 32)
+ if (namelen < 0 || namelen > 32)
namelen = 32;
down_read(&uts_sem);
kname = utsname()->domainname;
len = strnlen(kname, namelen);
- if (copy_to_user(name, kname, min(len + 1, namelen)))
- err = -EFAULT;
+ len = min(len + 1, namelen);
+ memcpy(tmp, kname, len);
up_read(&uts_sem);
- return err;
+ if (copy_to_user(name, tmp, len))
+ return -EFAULT;
+ return 0;
}
/*
@@ -739,13 +737,14 @@ SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
};
unsigned long offset;
const char *res;
- long len, err = -EINVAL;
+ long len;
+ char tmp[__NEW_UTS_LEN + 1];
offset = command-1;
if (offset >= ARRAY_SIZE(sysinfo_table)) {
/* Digital UNIX has a few unpublished interfaces here */
printk("sysinfo(%d)", command);
- goto out;
+ return -EINVAL;
}
down_read(&uts_sem);
@@ -753,13 +752,11 @@ SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
len = strlen(res)+1;
if ((unsigned long)len > (unsigned long)count)
len = count;
- if (copy_to_user(buf, res, len))
- err = -EFAULT;
- else
- err = 0;
+ memcpy(tmp, res, len);
up_read(&uts_sem);
- out:
- return err;
+ if (copy_to_user(buf, tmp, len))
+ return -EFAULT;
+ return 0;
}
SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer,
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index 7f3d9c59719a..452e4d080855 100644
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -197,23 +197,27 @@ SYSCALL_DEFINE5(rt_sigaction, int, sig,
SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
{
- int nlen, err;
-
+ int nlen, err;
+ char tmp[__NEW_UTS_LEN + 1];
+
if (len < 0)
return -EINVAL;
- down_read(&uts_sem);
-
+ down_read(&uts_sem);
+
nlen = strlen(utsname()->domainname) + 1;
err = -EINVAL;
if (nlen > len)
- goto out;
+ goto out_unlock;
+ memcpy(tmp, utsname()->domainname, nlen);
- err = -EFAULT;
- if (!copy_to_user(name, utsname()->domainname, nlen))
- err = 0;
+ up_read(&uts_sem);
-out:
+ if (copy_to_user(name, tmp, nlen))
+ return -EFAULT;
+ return 0;
+
+out_unlock:
up_read(&uts_sem);
return err;
}
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index 63baa8aa9414..274ed0b9b3e0 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -519,23 +519,27 @@ asmlinkage void sparc_breakpoint(struct pt_regs *regs)
SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
{
- int nlen, err;
+ int nlen, err;
+ char tmp[__NEW_UTS_LEN + 1];
if (len < 0)
return -EINVAL;
- down_read(&uts_sem);
-
+ down_read(&uts_sem);
+
nlen = strlen(utsname()->domainname) + 1;
err = -EINVAL;
if (nlen > len)
- goto out;
+ goto out_unlock;
+ memcpy(tmp, utsname()->domainname, nlen);
+
+ up_read(&uts_sem);
- err = -EFAULT;
- if (!copy_to_user(name, utsname()->domainname, nlen))
- err = 0;
+ if (copy_to_user(name, tmp, nlen))
+ return -EFAULT;
+ return 0;
-out:
+out_unlock:
up_read(&uts_sem);
return err;
}